diff --git a/ohos_adapter/media_adapter/include/media_codec_decoder_adapter_impl.h b/ohos_adapter/media_adapter/include/media_codec_decoder_adapter_impl.h
index 8f4650c10207346321bfd64d564c84f9c13bb965..5dd28bdc8a8c9dafd1701f783b0d8d345995edab 100644
--- a/ohos_adapter/media_adapter/include/media_codec_decoder_adapter_impl.h
+++ b/ohos_adapter/media_adapter/include/media_codec_decoder_adapter_impl.h
@@ -91,7 +91,7 @@ private:
     OH_AVCodec* decoder_ = nullptr;
     std::shared_ptr<DecoderCallbackAdapter> callback_ = nullptr;
     std::map<uint32_t, OH_AVBuffer*> bufferMap_;
-    std::mutex bufferMutex_;
+    std::mutex bufferMutex_; // To manage the input buffer.
     bool isHardwareDecode_ = true;
     bool isSecure_ = false;
     OH_AVCapability *avCap_ = nullptr;
diff --git a/ohos_adapter/media_adapter/src/media_codec_decoder_adapter_impl.cpp b/ohos_adapter/media_adapter/src/media_codec_decoder_adapter_impl.cpp
index a49f1877d3aa826a058eddb24d7b283e2796dc5b..4257152aa78ae8d2d1a7f18d9218067b72fb0008 100644
--- a/ohos_adapter/media_adapter/src/media_codec_decoder_adapter_impl.cpp
+++ b/ohos_adapter/media_adapter/src/media_codec_decoder_adapter_impl.cpp
@@ -400,8 +400,7 @@ DecoderAdapterCode MediaCodecDecoderAdapterImpl::ReleaseOutputBufferDec(uint32_t
         WVLOG_E("MediaCodecDecoder release buffer[%{public}u] fail.", index);
         return DecoderAdapterCode::DECODER_ERROR;
     }
-    std::unique_lock<std::mutex> lock(bufferMutex_);
-    bufferMap_.erase(index);
+
     return DecoderAdapterCode::DECODER_OK;
 }